PowerBass XL-1240MF

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.8dB
• Frequency response 32 - 500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 4.50
• Electrical quality factor QES 0.75
• Total quality factor QTS 0.71

Large signal parameters

• Maximum linear excursion xmax 9.5mm
• Air volume displaced at xmax VD 466cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.4Ω
• Inductance (1kHz, estimated) LE 1.79mH
• VC Diameter 51mm

Magnet

• Force factor Bl 11.6N/A
• Motor constant Bl/√RE 6.29N/√W
• Weight 3.97kg

Diaphragm

• Effective diameter 250mm
• Effective area SD 491cm²
• Moving mass MMS 117g
• Moving mass (without air load) MMD 109g
• Material Polypropylene

Suspensions

• Stiffness KMS 6.25N/mm
• Compliance CMS 160µm/N
• Equivalent volume to the compliance VAS 59L
• Mechanical resistance RMS 5.72N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Baffle cutout diameter 279mm
• Mounting depth 142mm
• Volume occupied by the driver (estimated) 2.4L